Double-action mechanism for pistols



March 15, 1949. w so 2,464,427

DOUBLE-ACTION MECHANISM FOR PISTOLS Filed Jan. 2, 1948 3 Sheets-Sheet 1Arkornegs March 15, 1 49. G. A'. WILSON 2,464,427

DOUBLE-ACTION MECHANISM FOR PISTOLS Filed Jan. 2, 1948 3 Sheets-SheetMarch 15, 1949. w so DOUBLE-ACTION MECHANISM FOR PISTOLS 3 Sheets-Sheet5 Filed Jan. 2, 1948 Attorneys Fatented Mar. 15, 1949 DOUBLE-ACTH?MECHANISM FOR PISTOLS necticut Appiication January 2, 1948, Serial No.65

5 Claims.

The present invention relates in general to firearms and moreparticularly to improvements in automatic pistols of the so-calledblow-back type. wherein the breechblock is moved rearwardly relative tothe barrel by gas pressure developed in the barrel and acting againstthe front face of the breechblock on discharge of a cartridge, therearward excursion of the breechblock being utilized to extract thespent cartridge from the chamber of the barrel.

An object of the present invention is to provide a superior automaticblow-back type of pistol characterized by a double-action mechanism ofeconomical and durable construction.

A further object of the invention is to provide an automatic blow-backtype of pistol with a superior double-action mechanism embodying easilyfabricated parts assembled in cooperative relationship with thefire-control mechanism of the pistol, so as to provide a direct andpositive connection between the hammer and trigger.

A still further object of the invention is to provide an automaticblow-back type of pistol with superior double-action mechanism whichrenders the primary sear inoperative and itself performs the function ofcooking and releasing the hammer on retraction of the trigger for firingthe first round of ammunition.

With the above and other objects in view, as will appear to thoseskilled in the art from the present disclosure, this invention includesall features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which certain modes of carrying out thepresent invention are shown for illustrative purposes:

Fig. l is a side elevation of a pistol embodying the double-actionmechanism of this invention;

Fig. 2 is an enlarged fragmentary side elevation with the cover-plate ofthe double-action mechanism removed and the hammer in its firingposition;

Fig. 3 is similar to Fig. 2 but with the hammer held in cocked positionby means of the doubleaction mechanism;

Fig. 4 is similar to Fig. 2 but with the hammer moved into cockingengagement with the primary sear by the action of the rearwardly movingbreechblock;

Fig. 5 is similar to Fig. 4 but with the breechblock returned to itschamber-closing position and the trigger released;

Fig. 6 is an end elevation on section line 6-6 of Fig. 2;

Fig. '7 is an end elevation on section line 1-1 of Fig.

Fig. 8 is a perspective view of the hammer;

Fig. 9 is a perspective view of the sear;

Fig. 10 is a perspective view of the trigger; and

Fig. 11 is a perspective View of the actuator and secondary sear-memberof the double-action mechanism.

Referring to the drawings, the latter show an exemplary embodiment ofthe invention designed for operation in an automatic blow-back type ofpistol which comprises, in the main, a frame 15 having a forward portionI6 on which the barrel ll of the pistol is secured; and a rearwardportion l8 provided with an integral downwardlyprojecting hollowpistol-grip [9 arranged to receive a box-magazine, said rearward portionhaving longitudinal guide-grooves Z! in its oppositesubstantially-vertical sides 22 in which the breechblock 23 of thepistol is slidably supported for movement longitudinally relative to thefixed barrel. Intersecting the rear end of the rearward portion of theframe, is a vertical slot 24 which is adapted to accommodate the pivotedhammer 25 and primary sear 26 of the fire-control mech-= anism.Referring especially to Fig. 3, the breechblock has a longitudinal axialaperture 2'! in which the firing-pin 28 is slidably mounted, the latterbeing urged normally rearwardly in the aperture 21 by a coil-spring 29mounted on the forward end of the firing-pin and arranged normally tohold its cartridge-striking end 30 rearwardly of the front face of thebreechblock and its hammer-engaging end 34 rearwardly of the rear end ofthe breechblock. The action-spring 32 of the piston illustrated hereinis mounted in a longitudinal aperture 33 of the breechblock between afixed abutment 3 3 in the forward end of the aperture 33, and one of apair of fixed abutments 35 projecting upwardly from the rear end of theframe, the action-spring 32 being adapted thus to retard the rearwardrecoil of the breechblock following the discharge of the pistol andthereafter to force the breechblock forwardly into breech-closingposition. During the rearward excursion of the breechblock, its rear endis adapted to engage the front face 36 of the hammer 25 above itstransverse pivot-pin 37 to pivot the hammer rearwardly or clockwise, asseen in Fig. 4, against the resisting force of a conventionalhammer-spring-and-link assembly into cooking engagement with the primarysear 26 of the pistol. The latter is pivoted as at 38 in the verticalslot 24 of the frame, forwardly of the hammer, its sear-nose 39 beingurged into engagement with either of two sear-notches 4i! and 4! of thehammer by the force of a conventional searspring-and-pilot assembly soas to hold the hammer in its halfor full-cocked positions, respectively.Thus, the hammer is cooked automatically with the firing of each shotand the subsequent rearward excursion of the breech block. In order tocook the hammer manually, the latter is provided with a knurledthumb-piece 42 by which the shooter may pull the hammer down manually toeither its halfor full-cocked position.

Referring especially to Fig. 9, the sear has, in addition to its usualsear-nose 354, an integral shoulder 43 which projects laterally from andat substantially right angles to the vertical lefthand face of the sear,the shoulder being formed forwardly of the transverse pivot-pin 38 ofthe sear and sloped upwardl and forwardlyat an angle of substantially 9to a line perpendicular to the top edge thereof. The upper end of thesear-shoulder 43 intersects the top edge of the sear, while the lowerend of the shoulder is squared off at a point approximately intermediatethe top edge of the sear and the center of the sear-pin. Thissear-shoulder 43 constitutes an element of the improved double actionmechanism of this invention, additional elements of which are describedbelow.

Referring now to Figs. 2, 3 and 10, the trigger of the pistol is shownat 44 and is pivotally mounted on a transverse pivot-pin 45 in avertical recess 46 in the forward part of the frame. The finger-piece 41of the trigger projects downwardly into the trigger-guard 48 of theframe and is resiliently held forwardly in the triggerguard by the forceof a trigger-spring-and-pilot assembly acting against the upper end asof the trigger above its pivot-pin 45 to pivot the trigger clockwise, asseen in Fig. 2.

The double-action mechanism is adapted to connect the trigger to thehammer of the pistol so that the first shot may be fired simply bypulling the trigger, the rearward draft on the trigger serving both tocook the hammer and thereafter to release the latter against thefiringpin. The double-action mechanism serves also in the normaloperation of the pistol, that is to say, when the hammer is cocked bythe primary sear, to disengage the latter therefrom and fire the pistol.The double-action mechanism is mounted, preferably, in one of thevertical sides 22 of the pistol-frame and to this end, the lefthand sideof the latter is provided with a longitudinal relatively-shallow recess59, the over-all length of which is slightly greater than the distancebetween the pivot-pins of the trigger and hammer, respectively. Asshown, the opposite ends of the recess 50 are preferably arcuate and theupper and lower sides and 52 respectively of the recess are substantiallparallel, the lower side extending longitudinally of the rear endportionof the frame immediately above the juncture of the upper end of thepistol-grip l9 therewith; and the upper side 5i extending parallel toand immediately below the corresponding guide-groove 2| of the frame,being separated therefrom by a longitudinal rib 53. Formed in the bottomof the shallow recess 50 is a longitudinal groove 54 which extends fromthe forward end of the recess rearwardly and upwardly at a relativelyslight angle to a point substantially intermediate the opposite ends ofthe recess, at which point the longitudinal groove 54 intersects acutout 55 in the bottom of the recess 50, this cutout beingsubstantially equal in depth to that of the groove 54 and extendingsubstantial y to the rear end of the recess.

The forward edge of the bottom half of the cutout forms a ledge 56 withthe lower edge of the recess 59, while the top edge of the cutoutimmediately rearwardly of the rear end of the longitudinal groove 54 isextended upwardly to intersect the longitudinal guide-groove 2! of theframe, the intersecting portion of the cutout being elongated andhereinafter referred to as the clearance-recess 51. The top edge of thecutout also intersects the separating-rib 53 rearwardly of theclearance-recess 51 to form an elongated clearance-slot 53, whichconstitutes the upper edge of an elongated aperture 59. The latterextends inwardly transversely to intersect the vertical hammer-and-searrecess 24 at the rear end of the frame substantially opposite theshoulder 43 of the sear to provide access thereto from the cutout 55.Between the forward end of the clearance-slot 58 and the clearancerecess51 is a relatively-short length of the separating-rib 53, the bottomrear corner of which constitutes a. cam-engaging surface 60 for thepurpose hereinafter described; Formed in the forward end of thelongitudinal groove 54 is an elongated aperture El which extendstransversely of the frame and is adapted to intersect the upper end ofits vertical trigger-recess 46 to provide access to the upper end of thetrigger from the groove in the left-hand side of the frame. As shownespecially well in Fig. 10, a shouldered trigger-pin 52 is secured tothe upper end of the trigger substantially opposite the elongatedaperture 6! so as to extend outwardly transversely therethrough into thelongitudinal groove 54 of the frame. A second elongated aperture 63 isprovided in the cutout 55 adjacent the rear end thereof and directlybeneath the pivot-pin 37 of the hammer, this aperture '63 extendingtransversely into the vertical hammerand-sear slot 24 of the frame toprovide access to the hammer from the cutout in the left-hand side ofthe frame. As shown especially well in Fig. 8, a pin 64 is carried onthe hammer below and slightly 'to the rear of its pivot-pin 31, and isadapted to extend outwardly transversely through the elongated aperture63 into the rear end of the cutout 55. Referring especially to Figs. 2,5 and 11, the d0uble-action mechanism comprises, in the main, alink-member 65 which is slidably mounted in the longitudinal groove 54and is pivotally connected at its forward end to the outer end of theshouldered trigger-pin 62 which extends outwardly through the elongatedaperture (il in the forward end of the groove 54 The width of thelink-member is somewhat less than the width of the longitudinal groove54 so as to permit the link-member to move freely upwardly and forwardlytherein on retraction of the finger-piece of the trigger. The rear endof the link-member is normally at substantially the rear end of thecutout and is characterized by a longitudinally-elongated notch 66 inits upper edge, the rear wall of which constitutes a radius curvingupwardly and forwardly, the lower portion thereof constituting acocking-abutment 51 and the upper portion thereof comprising a secondarysear-shoulder 68, for the purpose hereinafter described.

The forward wall of the notch 68 constitutes a substantially-verticalrearwardly-facing shoulder 69 hereinafter referred to as a thrustabutment against which the transversely-projecting pin'of the hammer isadapted to engage for thrusting the link-member forwardly in its groove54, as the hammer is pivoted rearwardly into its halfcocked orfull-cocked positions. When the hammer is in its normal uncookedposition, the thrust abutment 69 is held against the transverse pin 64of the hammer by the force of the triggerspring acting normally tothrust the link-member rearwardly. The elongated notch 65 of thelink-member is adapted to be held up normally in cooperativerelationship with the transverse pin 64 of the hammer by the force of aresilientmember comprising a leaf-spring frictionally secured at itsrear end in a slot in the underside andadjacent the rear end of thelink-member; and 'slidably engageable at its forward end with thestepped ledge 56 of the cutout. Formed integrally on the upper edge ofthe link-member and immediately opposite the clearance-recess 51 of thecutout 55 is a disconnector-means H comprising an upwardly-projectinglug rounded over on its opposite ends and adapted to project upwardlyand outwardly into the guidegroove 2| of the frame and to movelongitudinally freely in the elongated clearance-recess 5'5 of thecutout 55. The portion of the link-member between its disconnector-meansH and its elongated notch 65 slopes downwardly and rearwardly and isprovided on its upper edge with an integral upwardly-projectingflange-portion E2, the forward edge of which comprises anupwardly-and-rearwardly-sloping cam-surface 13 arranged normally beneathand rearwardly of the cam-engaging surface 69 of the separating-rib 53and adapted to cooperatively engage therewith in the manner and for thepurpose hereinafter described. Rearwardly of the cam-surface 13 of theflange '52, the latter is provided with an integral lip-portion Hi whichis arranged to extend inwardly freely into the elongated transverseaperture 59 of the cutout, the forward edge of the lip it slopingrearwardly and having a substantially-rectangular tongue-portion 15 atits inner end, the forward edge 16 of which is located normallyrearwardly of the shoulder 43 of the sear and is adapted to engage thelatter and'move it out of operative engagement with the hammer ashereinafter described, the forward edge 16 of the tongue beinghereinafter referred to as a primary sear-abutment. The recess 50 of theframe is adapted to accommodate a cover H (see Fig. l) which not onlyprotects the operating parts of the double-action mechanism from dirt,moisture, and the like, but also serves tohold the linkmember of thedouble-action mechanism in as sembled position on the respective pins ofthe trigger and hammer, the cover being fixedly secured in the recess 50in any suitable manner.

The operation of the double-action mechanism may be described briefly asfollows:

On retracting the finger-piece M of the trigger, the link-member 55 ispulled forwardly in its groove 54 and cutout 55 of the frame, therebybringing the cocking-abutment 6'! of the elongated notch 66 at the rearend of the link-member into engagement with the back side of thetransversely extending hammer-pin 64. Continued rearward movement of thefinger-piece 41 of the trigger pulls the hammer-pin forwardly,

thereby pivoting the hammer clockwise about its transverse pivot-pin 3?against the resisting force of the hammer-spring and advancing thecam-surface 13 of the link-member into juxtaposition to the cam-engagingsurface 68 of the separating-rib 53. On continuing the forward movementof the link-member, the primary sear abutment l6 thereof engages theshoulder 43 of the primary sear and pivots the latter counterclockwise,thereby withdrawing its sear-nose 39 out of cooperative relationshipwith the searnotches of the hammer. Further rearward movement of thetrigger and the consequent forward movement of the link-member thenbrings the cam-surface E3 of the link-member into engagement with thecam-engaging surface 66 of the separating-rib of the frame, whereuponthe rear end of the link-member is depressed against the restrainingforce of the leaf-spring 10. With the depression of the rear end of thelink-member, its cocking-abutment 61 is withdrawn from engagement withthe back side of the transverse pin M of the hammer, the secondarysear-shoulder 68 of the notch initially engaging and almost immediatelythereafter disengaging the hammerpin 64, thereby releasing the hammerwhich has been pivoted nearly into its full-cocked position. Thecompressed hammer-spring thereupon swings the hammer forwardlyforcefully against the rear end of the firing-pin to discharge acartridge in the chamber of the barrel. Immediately on discharge of thecartridge, the breechblock 23 begins to recede from the fixed barrelsliding rearwardly in the guide-grooves 2! of the frame. As thebreechblock begins its rearward excursion, a clearance-recess isprovided in the left-hand side thereof for accommodating thedisconnectorlug H of the link-member, is displaced rearwardly relativeto the disconnector-lug ii, the forward edge of the clearance-recess l9cammingly engaging the rounded front edge of the lug H, thereby forcingthe latter downwardly, whereupon the primary sear-abutment iii of thelinkmember is withdrawn from engagement with the shoulder (13 of theprimary sear so as to release the latter and permit it to return intocooperative relationship with the hammer. Consequently, as the latter isforced back automatically into its cocked position by therearwardly-moving breechblock, the primary sear will initially ride overand subsequently engage the sear-notch M of the hammer to hold thelatter in its full-cocked position, following the return of thebreechblock to its forward breech-closing position. With the movement ofthe sear into the position for cocking engagement with the hammer, thelower end of the sear-shoulder 43 of the primary sear 26 rides over thetongue it of the depressed link-member to hold the rear end of thelatter down, as a consequence of which it is impossible to disengage thesear from the hammer without first releasing the trigger so as to permitthe link-member and more particularly its tongue to move rearwardly outfrom beneath the lower end of the sear-shoulder. On releasing thetrigger, the force of the triggerspring thrusts the link-memberrearwardly and simultaneously the leaf-spring urges the rear end of thelink-member upwardly, whereby the tongue E5 of the link-member moyesrearwardly and upwardly from beneath the lower end of the searshoulder43 to position-thexprimary sear-abutment #6 in juxtapositiontdthe rearface thereof. It will be appreciated thati nasmuch as the leafspring ofthe link-member urges the rear end thereof upwardly, the thrust-abutmentof its elongated notch engages against the transverse pin of the hammer,and that since the latter is in its full-cocked position, its pin is inits foremost position in its aperture 63, whereby the link-member isheld forwardly of its normal rearmost position, that is to say, thetrigger remains in a partially-retracted position (see Fig. in which theprimary sear-abutment T6 of the tongue is immediately rearwardly of theshoulder of the primary sear. Consequently, a relatively-short rearwardpull on the finger-piece of the trigger will move the primarysear-abutment 16 of the link-member forwardly into engagement with theprimary sear and disengage the latter from the sear-shoulder M of thehammer to permit it to swing forwardly for firing the next-succeedingshot. After the final shot has been fired and the trigger pulled oncemore to release the hammer from its cocked position, the latter returnsto firing position wherein its transverse pin 64 is at its rearmostposition in its aperture 63, and hence on releasing the trigger, thelinkmember and more particularly the thrust-abutment 69 of its elongatednotch, moves rearwardly in the cutout to its original rearmost positiontherein, the leaf-spring of the link-member elevating the rear end ofthe link upwardly so as to engage the cocking-abutment 67 of theelongated notch with the rear face of the hammer-pin t t.

The arm is thus readied for firing the first round of a new magazine onretracting the trigger.

As pointed out above, the double action mech- 'anis'm comprisesessentially a single link-member which functions as an actuator of thehammer and primary sear of the firearm and also as a secondary sear torelease the hammer. Moreover, the double-action mechanism embodies adisconnector operable by the relative movement of the breechclock toprevent doubling, the link-member of the double-action mechanism beingcharacterized by its simplicity of construction and operation, theentire assembly being retained within the groove in the, side of theframe and effectively concealed and retained in operative relationshiptherein by the cover-member fitting into the recess in the side of theframe.

The invention may be carried out in other specific ways than thoseherein set forth without departing from the spirit and essentialcharacteristics of the invention, and the present embodiments are,therefore, to be considered in all respects as illustrative and notrestrictive, and all changes coming within the meaning and equivalencyrange of the appended claims are intended to be embraced therein.

I claim: 1. An automatic pistol of the blow-back type,

including in combination: a frame; fire-control mechanism including atrigger mounted in the forward part of said frame, a hammer mounted inthe rear part thereof, and a primarysear having a sear-shoulder; anddouble-action mechanism to connect said trigger and said hammer, saidmechanism comprising an actuator-andsecondary-sear-member arranged to bemoved forwardly by retraction of said trigger and having acocking-abutment adjacent its rear end and a'thrust-abutment forwardlythereof, cocking-abutment being arranged normally toengage said hammerand sequentially to cock said hammer and then to disengage the latter asa result of the forward movement of saidactuator-andsecondary-sear-member by retraction of said trigger, aspring carried by said actuator-andsecondary-sear-member and arranged tocooperatively engage said frame to urge said cockingabutment intore-engagement with said hammer on release of said trigger, a primaryabutment arranged to be actuated by the forward movement of saidactuator-and-secondary-sear-member to engage said sear-shoulder anddisable said primary sear prior to the release of said hammer, and adisconnector operable on release of said hammer and the subsequentdischarge of said pistol to positively withdraw said primarysearabutment from disabling engagement with the sear-shoulder of saidprimary sear so as to permit said primary sear to cook said hammer, saidaotuator-and-secondary-sear-member being arranged also to be movedforwardly by engagement of said hammer with the thrust-abutment thereofwhen said hammer is moved into cocked engagement with said primary searto position said primary sear-abutment in cooperative relationship withsaid sear-shoulder, thereby to disengage said primary sear from saidhammer on retraction of said trigger.

2. An automatic pistol of the blow-back type, including in combination:a frame having a camsurface; fire-control mechanism including a triggermounted in the forward part of said frame, a hammer mounted in the rearpart thereof, and a primary sear; and double-action mechanism to connectsaid trigger and said hammer, said mechanism comprising anactuator-and-secondarysear-member arranged to be moved forwardly byretraction of said trigger and having a cam-surface arranged tocooperatively engage with the cam-surface of said frame during theforward movement of said actuator-and-secondary-searmember to depressthe rear end thereof, a cock ing-abutment at the rear end of saidactuatorand-secondary-sear-member and a thrust-abutment forwardlythereof, said cocking-abutment being arranged normally to engage saidhammer and sequentially to cook said hammer as a result of the forwardmovement of said actuator-andsecondary-sear-member by retraction of saidtrigger and thereafter to disengage said hammer as a result of thedepression of the rear end of said actuator-and-secondary-sear-member,and a primary sear-abutment arranged to be actuated by the forwardmovement of said actuator-andsecondary-sear-member to engage and disablesaid primary sear prior to the release of said hammer, saidactuator-and-secondary-sear-member being arranged also to be movedforwardly by engagement of said hammer with the thrust-abutment thereofwhen said hammer is moved into cocked engagement with said primary searto position said primary sear-abutment in cooperative relationshipthereto, thereby to disengage said primary sear from said hammer onretraction of said trigger.

3. An automatic pistol of the blow-back type, including in combination:a frame having a camsurface; fire-control mechanism including a triggermounted in the forward part of said frame, a hammer mounted in the rearpart thereof, and a primary sear; and double-action mechanism to connectsaid trigger and said hammer, said mechanism comprising anactuator-andsecondary-sear-member arranged to be moved forwardly byretraction of said trigger and having a cam-surface arranged tocooperatively engage with the cam-surface of said frame during theforward movement of said actuator-and-secondary-sear-member to depressthe rear end thereof, a cocking-abutment at the rear end ofsaidactuator-and-secondary-sear-member and a. thrust-abutment forwardlythereof, said cockingabutment being arranged normally to engage saidhammer and sequentially to cook said hammer as a result of the forwardmovement of said actuator-and-secondary-sear-member by retraction ofsaid trigger and thereafter to disengage said hammer as a result of thedepression of the rear end of said actuator-and-secondary-searmember, aleaf-spring secured at its rear end to saidactuator-and-secondary-sear-member and slidably engaged at its forwardend with said frame to urge said cocking-abutment into reengagement withsaid hammer on release of said trigger, and a primary sear-abutmentarranged to be actuated by the forward movement of saidactuator-and-secondary-sear-member to engage and disable said primarysear prior to the release of said hammer, saidactuator-and-secondarysear-member being arranged also to be movedforwardly by engagement of said hammer with the thrust-abutment thereofwhen said hammer is moved into cocked engagement with said primary searto position said primary sear-abutment in cooperative relationshipthereto, thereby to disengage said primary sear from said hammer onretraction of said trigger.

4. An automatic pistol of the blow-back type, including in combination:a frame having a camsurface; a breechblock reciprocably mounted on saidframe; fire-control mechanism including a trigger mounted in the forwardpart of said frame, a hammer mounted in the rear part thereof, and aprimary sear; and double-action mechanism to connect said trigger andsaid hammer, said mechanism comprising anactuator-andsecondary-sear-member arranged to be moved forwardly byretraction of said trigger and having a cam-surface arranged to be movedinto cooperative engagement with the cam-surface of said frame duringthe forward movement of said actuator-and-secondary-sear-member todepress the rear end thereof, a cocking-abutment at the rear end of saidactuator-and-secondary-searmember and a thrust-abutment forwardlythereof, said cocking-abutment being arranged normally to engage saidhammer and sequentially to cook said hammer as a result of the forwardmovement of said actuator-and-secondary-searmember by retraction of saidtrigger and then to disengage said hammer as a result of the depressionof the rear end of said actuator-and-secondary-sear-member, a primarysear-abutment arranged to be actuated by the forward movement of saidactuator-and-secondary-sear-memher to engage and disable said primarysear prior to the release of said hammer and a disconnector carried bysaid actuator-and-secondary-sear-member arranged to be cooperativelyengaged by said breechblock following the discharge of said pistol topositively withdraw said primary sear-abutment from disabling engagementwith said primary sear so as to permit said primary sear to cock saidhammer, said actuator-and-secondary-sear-member being arranged also tobe moved forwardly by engagement of said hammer with the thrust-abutmentthereof when said hammer is moved into cocked 10 engagement with saidprimary sear to position said primary sear-abutment in cooperativerelationship thereto, thereby to disengage said primary sear from saidhammer on retraction of said trigger.

5. An automatic pistol of the blow-back type, including in combination;a frame having a camsurface; a breechblock reciprocably mounted on saidframe; fire-control mechanism including a trigger mounted in the forwardpart of said frame, a hammer mounted in the rear part thereof, and aprimary sear having a sear-shoulder; and double-action mechanism toconnect said trigger and said hammer, said mechanism comprising anactuator-and-secondary-sear-member arranged to be moved forwardly byretraction of said trigger and having a cam-surface arranged to be movedinto cooperative engagement with the cam-surface of said frame duringthe forward movement of said actuator-and-secondary-sear-member todepress the rear end thereof, a cocking-abutment at the rear end of saidactuator-and-secondary-sear-member and a thrust-abutment forwardlythereof, said cocking-abutment being arranged normally to engage saidhammer and sequentially to cook said hammer as a result of the forwardmovement of said actuator-and-secondary-sear-member by retraction ofsaid trigger and then to disengage said hammer as a result of thedepression of the rear end of said actuator-and-secondary-sear-member, aleaf-spring secured at its rear end to saidactuator-and-secondary-sear-member and slidably engageable at itsforward end with said frame to urge said cocking-abutment intoreengagement with said hammer on release of said trigger, a primarysear-abutment arranged to be actuated by the forward movement of saidactuator-and-secondary-sear-member to engage said sear-shoulder anddisable said primary sear prior to the release of said hammer, and adisconnector carried by said actuator-and-secondary-sear-member arrangedto be cooperatively engaged by said breechblock following the dischargeof said pistol to positively withdraw said primary sear-abutment fromdisabling engagement with the sear-shoulder of said primary sear so asto permit said primary sear to cook said hammer, saidactuator-and-secondary-searmember being arranged also to be movedforwardly by engagement 'of said hammer with the thrust-abutment thereofwhen said hammer is moved into cocked engagement with said primary searto position said primary sear-abutment in cooperative relationship withsaid sear-shoulder, thereby to disengage said primary sear from saidhammer on retraction of said trigger.

' GEORGE A. WILSON.

No references cited

